231242538 has 48 divisors (see below), whose sum is σ = 481011840. Its totient is φ = 74096064.

The previous prime is 231242537. The next prime is 231242569. The reversal of 231242538 is 835242132.

It is a super-2 number, since 2×231242538² = 106946222761362888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231242537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 967423 + ... + 967661.

It is an arithmetic number, because the mean of its divisors is an integer number (10021080).

Almost surely, 2^231242538 is an apocalyptic number.

231242538 is an abundant number, since it is smaller than the sum of its proper divisors (249769302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231242538 is a wasteful number, since it uses less digits than its factorization.

231242538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 364 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 231242538 is about 15206.6609747176. The cubic root of 231242538 is about 613.7939109646.

It can be divided in two parts, 2312 and 42538, that added together give a triangular number (44850 = T₂₉₉).

The spelling of 231242538 in words is "two hundred thirty-one million, two hundred forty-two thousand, five hundred thirty-eight".